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Post by mike3132 on Sept 16, 2004 13:35:09 GMT -5
After reading Edges post the other day about knurling bullets and an article Toby wrote a few months ago about how loose fitting the new Barnes Spitfires were and how they needed sub-bases to get good accuracy, i decided to roll one in a file. The Spitfire mics @ .450-.4505 out of the box. after rolling one between two flat files for about 30 seconds it mic'ed @ .452. I did several and they all went to .452-.4525 after knurling them. They also really grab the sabot. I will try to shoot them sometime in the next few days to see how accurate the are. Here are a couple of before and after pics. mike   |
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Post by Rifleman on Sept 16, 2004 13:56:15 GMT -5
Mike3132
I for one am keenly interested in the results, Thanks for posting this information.
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Post by dave d. on Sept 16, 2004 20:09:27 GMT -5
:)mike,i to am interested in your results's i might try this with the 200sst just for the hell of it.thank's for posting the picture.
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Post by mike3132 on Sept 18, 2004 18:51:49 GMT -5
Got a chance to try the knurled bullets today. The load was 4.3 dipper (about 48grns) of sr4759, barnes 245grn spitfire with supplied sabot, cci 209 m primer @110yds. temp was 60-70 degrees. it shot 7/8" group. the sabots looked good. the bullet/sabot load snug but not real tight. the knurling must help with the seal. you can see the knurl marks inside the sabot where the bullet grab the sabot. looks like this might be the answer to poor accuracy with these spitfires. i plan on doing so more testing when the weather gets into the 40's. mike   |
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Post by dave d. on Sept 18, 2004 19:08:01 GMT -5
:)mike,that's some really good shooting and a very nice group look's like the knurling worked.
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Post by Rifleman on Sept 18, 2004 19:37:38 GMT -5
cool and great shooting I might try this with the 200 gr sst.
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Post by Whitefan on Sept 18, 2004 19:40:00 GMT -5
Great group there mike!
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KS
Six pointer
Posts: 93
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Post by KS on Sept 18, 2004 21:46:56 GMT -5
I don't remember what edge has posted on this, so if this looks rerun I'll say I'm sorry right now. First question . Does any one know if this will tighten up groups on higher velocity loads with normal 451-452 bullets, ie. xtps,sst, etc. Second, would knurling the base of the bullet do any better? Third, has anyone tried to knurl bullets in a lathe with a knurling tool? I realize that this topic isn't that old, so maybe this is more food for thought than questioning. Looks like some better shooting than I am capable of. KS
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Post by mike3132 on Sept 18, 2004 22:40:14 GMT -5
Thanks guys,
Its funny how just some minor changes make a world of difference sometimes. I never would have thought of doing this if it hadnt been for Edge's post.
KS,
I dont know if knurling would help SST, XTP but who knows, it will give you a couple thousands diameter which means a tighter fit.
Edge can probably answer your question about knurling the base and im pretty sure he has knurled them in a lathe.
Rifleman,
Let us know how it works on those 200 SST's.
mike
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Post by DannoBoone on Sept 19, 2004 10:52:59 GMT -5
mike, what #files did you use?
Yes, guys, this could be a boost to the 200gr SST, also.
Wonder what, if any, improvement this would make with
the lead DC's & QT's?
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Post by mike3132 on Sept 19, 2004 14:02:31 GMT -5
danno,
one of the files is a number 1 and the other is a cheap china made file with no number but it exactly like the #1. i wish they were the next bigger file but these worked ok. mike
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Post by Rifleman on Sept 19, 2004 14:08:57 GMT -5
Ah So numbha one vely good
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Post by IndianaHunter on Oct 24, 2004 19:19:53 GMT -5
Do you just roll the top file and make the bullet go back and forth...
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Post by mike3132 on Oct 24, 2004 22:05:22 GMT -5
That would be correct. Press firmly down and roll it back and forth. I use a mic to check the diameter and usually it gains .0015-002. Pretty easy to do. mike
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Post by PPosey on Oct 25, 2004 7:20:54 GMT -5
Wonder how much this effects the BC of the bullet??
did you notice a different inpact point than the unknurled ones
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Post by mike3132 on Oct 25, 2004 16:52:05 GMT -5
Dont know what it does to BC, would guess not much. Havent shot any with out knurling so cant answer that either. All the knurling does it make the diameter bigger and seems to keep the bullet from slipping in the sabot.
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Post by bucknbass on Oct 26, 2004 20:45:39 GMT -5
I stopped by Home Depot tonight and bought a couple of files. 12 - 15 passes and my Spitfires that were .450 are all .452! What a cool trick. I think it might help my gun at 100 yards. I sure hope so!
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Post by mike3132 on Oct 26, 2004 21:58:48 GMT -5
bnb,
let us know how they shoot. mike
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Post by bucknbass on Oct 26, 2004 22:03:00 GMT -5
Mike,
I will report back. I just tried knurling some Shockwaves and it worked great on those too. Same result as the Barnes. Most went to .4525 after knurling.
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Post by bucknbass on Oct 31, 2004 19:37:09 GMT -5
Mike - you are the MAN! I went to the range today for one last session. I had resigned myself to not hunting with the Savage if I didn;t get it shooting well today. I tried the knurled Spitfires with 42gr. of N110 and Fed 209A primers.
First shot was attempted wit MMP short petal sabot and it was easy to get down the barrel. Took the shot and decided to try the supplied sabot on the next one because yours looked so good.
Next time shot supplied sabot and it there was plenty of resistance going down the barrel - good I thought. Took that shot at 50 and moved the scope for the next shot. What do you know, it hit right where I exoected it to the next time.
OK, here's the test. Lets go to 100 yards. First shot hit 1/2" low and 2.5" to the right. Didn't move scope for the next shot and it HIT THE SAME HOLE! Before this I couldn't even hit a 2'x2' target board at 100! Moved the scope to where it should be dead on and guess what, it was.
I am VERY excited because I know now I've got a shooter and with my favorite bullets, Barnes. I prefer the Expanders and will test with them after the season but the Spitfires will do just fine for now.
I recovered most of the sabots and they looked awesome. Did I mention that I'm PUMPED UP?
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Post by Rifleman on Oct 31, 2004 19:48:10 GMT -5
I got to get off my dead butt and try this with the 200gr SST's.
Has anybody else tried this on the 200 sst yet?
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Post by mike3132 on Oct 31, 2004 19:52:00 GMT -5
bnb,
glad it worked for you too! i am a barnes bullet fan and had good luck with them killing whitetail.
with that kind of accuracy looks like you'll have no trouble harvesting a deer. good luck on you hunting season, mike
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Post by bucknbass on Oct 31, 2004 20:12:29 GMT -5
Thanks Mike. I've already had my best season yet. I went to KY for a muzzleloader hunt and killed a very large 10 point with my Omega. I'm very proud of the shot as it was 150 yards and I hit him exactly where you would draw a dot on one if you could. I was shooting the Barnes 300gr. Expanders on that hunt.
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Post by RBinAR on Nov 1, 2004 13:52:05 GMT -5
Wonder how much this effects the BC of the bullet?? Not much! To do enough air disruption on the bearing surface of the bullet to affect the BC would also cause enough disruption to cause some accuracy problems. |
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Post by PPosey on Nov 1, 2004 15:12:41 GMT -5
wobble wobble, tumble splattttttt,,,,,,,,,
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Post by SavageShooters on Nov 4, 2004 3:38:00 GMT -5
Interesting! I'll have to make a note of this for when I do my comparison testing next month.
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Post by Rifleman on Nov 4, 2004 5:28:49 GMT -5
Up to this point in time we have not heard from anyone that has knurled the 200gr sst and shot it for accuracy. This is on my "to do" list but if anyone has allready done it , it would be nice to hear of the results.
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Post by SW on Nov 4, 2004 7:13:18 GMT -5
Up to this point in time we have not heard from anyone that has knurled the 200gr sst and shot it for accuracy. This is on my "to do" list but if anyone has allready done it , it would be nice to hear of the results. I have. I have a 2680'/sec load that I'm keeping close to MOA with a washered sabot, no sub base. Could tell no impact nor accuracy difference between knurled and std 200SSTs. Much more testing tomorrow. I only roughened the surface - no more than 0.405" vs 0.400". |
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Post by Rifleman on Nov 4, 2004 7:48:38 GMT -5
Thanks for the update Steve.
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Post by mike3132 on Nov 10, 2004 12:38:50 GMT -5
sw,
have you tried the knurled 200 ssts without a washered sabot just using a regular sabot? i wonder if the knurling would grab the sabot and maybe stop the "sabot drilling effect" that happens with light weight bullets at fast speeds. mike
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