Velocity vs BC importance

[SW]

I read something on this board that I tried to pass-up and not comment but just can't. Someone stated XTPs are best suited to slower MLs and higher BC bullets were better suited for faster MLs(10-ML). I disagree and will show why. My son and I use my TC Hawken with a 28" retrofit barrel 28" twist,scoped and very accurate as a back-up rifle. I shoot 5g FFF below 85g T-7 FF(oops a duplex!). Observe the following calculations and come to your own conclusion what bullet you'd use.
250XTP(BC.147) 250SST(BC.210) 200SST(BC .23)
HIT FT # HIT FT # HIT FT #
50y +1" 1292 +.8" 1404 +.9 1577
100 0 984 +0 1155 +1 1328
150 -5.9" 767 -5.1 957 -1.8 1115
200 -18.1 629 -15 801 -7.9 933
250 -37.9 542 -31.3 689 -18.4 745
Note that the 250XTP is down to 800'# energy at 140 yds and the 250SST still has 800'# energy at 200yds and the 200SST has 800'# energy to 245 yds. This was based on what I think is a very conservative BC for the 200SST which I think is much higher at this speed. My conclusion and long held conviction is that as velocity goes down I want the sleekest bullet I can get. This is based on 1750'/sec for the 250 bullets and 2050'/sec with the 200SST(I up the T-7 to 95g with the 200SST).

[SW]

Sorry my table is all scruntched-up. It wasn't when I typed it and pressed "post". Don't know why it did that. If I want it all scruntched-up I'll type it that way.

[edge]

SW said:

I read something on this board that I tried to pass-up and not comment but just can't. Someone stated XTPs are best suited to slower MLs and higher BC bullets were better suited for faster MLs(10-ML).
SNIP

I am not sure, since you didn't say, but it sounds like my post:
Re: SST vs. XTP
« Reply #1 on: Today at 09:13am »<br>
Assuming that it is, MY response has to do with Bullet Terminal Performance, and NOT the Exterior Ballistics!
Clearly, the SST will have a better mid-range trajectories and that will result in more on-target energy.

The SST has a MUCH greater chance of remaining intact at Smokeless velocities.

edge.

[RandyWakeman]

edge said:

The SST has a MUCH greater chance of remaining intact at Smokeless velocities.

edge.

I'm not sure what your definition of "smokeless velocities" might be-- but if toughness in a bullet is what you seek, surely a Partition Gold or a Barnes Spitfire exceeds the "muzzleloading" SST.

[edge]

Randy, the Subject that I was responding to was SST vs XTP!!!

edge.

[SW]

Edge,
Wasn't your response I made reference to. But, I could have easily missed the intent of the post though it infered that hi- preformance MLs needed higher BC bullets while it doesn't matter as much with lower velocity MLs. I just wanted to show that ballistically superior bullets can have a significant effect on the effective range of traditional MLs. My experience with the XTP has been more favorable than yours : more traditional expansion out of the Hawken and much greater expansion, though not explosive, even with a 2600+'/sec at a close range shot. I think that the SST will probably perform better over a wider range of velocities than the XTP. Remember that we do differ on ideal terminal performance on thin- skinned, med game. I do accept my view as just an opinion w/o depth of experience. I'm primarily a bow-hunter with appx 20 deer killed with MLs ranging from roundballs to the SST. After reading extensively on ideal terminal performance, most of which is somewhat dated and written at a time when absolutes were more readily accepted, I respectfully disagree with only 2 divisions of game : small and large. I catagorize game as small(coyote on down) - best with explosive bullets(40-50NBTs/Blitz Kings,etc), med game(WT) - best with performance closer to the former, yet not so much it couldn't penetrate a shoulder, and large,dangerous (something that could eat you or at least kill you) - needs to be able to penetrate and in most cases expand. With all this said, I've yet to shoot a deer that wasn't out of the chest area so I have little practical experience in the general scheme of things. Summary - I think the SST will serve most of us quite well though I'm sure it will be surpassed, and likely has been with some of the bullets you are already testing.

[RBinAR]

8-)If we BC discuss again I gonna say it ain't that complicated. I can say that that I almost, one day, long ago, under the influence, may have nearly understood it... possibly.

All puns aside: use as high a BC a bullet as will effectively take the game you are after and be accurate and powerful in the system. Simple rule, works every time, enough said, even if there is room to debate what is the best combination of accuracy, power, and terminal effect.

[edge]

SW,

We really are not that far apart, however I see game on more of a sliding scale than I do in specific categories. A 1 1/2 year old Whitetail @ 125 lbs is certainly not as tough as a 350 lb Canadian Trophy!

I do like the SST, and for that matter the XTP has served us well too! My complaints are with excessive entrance wound "meat damage", which results in greatly reduced penetration due to energy loss, AND their inability to stay in one piece which means that they MAY not follow the intended shotline.

At BP velocities, both of these bullets may be perfect, but I would PREFER a tougher bullet at the higher velocities. PLEASE NOTE: I did not say that I want a FMJ, nor did I say that I want a Dangerous Game bullet! Merely a bullet that will hold together without creating a hole that you could put a bowling ball into :-)

edge.

[RBinAR]

8-)Now here I was agreeing with everything you were saying taking into account that you were carefully stating your preference versus a hard rule and then you typed this "which results in greatly reduced penetration due to energy loss", GGRRRRRRRR!

Now I have to make another post that is gonna peg me as biggest nerd in the known world and I don't want to.
THERE IS NO ENERGY LOSS! There is only how much of the kenitic energy of the bullet that can be converted to other types of energy. A quickly slowing down bullet is more efficient at making Ke into other types than one that takes more time to stop PERIOD. That extra energy does lots of things some of it is kill the deer energy.

[edge]

RBinAR said:

8-)SNIP
THERE IS NO ENERGY LOSS! There is only how much of the kenitic energy of the bullet that can be converted to other types of energy. A quickly slowing down bullet is more efficient at making Ke into other types than one that takes more time to stop PERIOD. That extra energy does lots of things some of it is kill the deer energy.

In RELATIVE terms :-)

The bullet Slows down by causing tissue damage and heat. You are correct, this is not a nuclear reaction!

The TRANSFER :-) of energy results in a cavernous entrance wound, which under certain circumstances may leave the "projectile mass" well short of the vitals.

Better ?

edge.

[RBinAR]

8-)OK can I go back to being brain dead now?

[edge]

TOO LATE ;D

[DannoBoone]

;D ;D

You two are just tooooo funny!

[bubba]

edge said:

SW,

We really are not that far apart, however I see game on more of a sliding scale than I do in specific categories. A 1 1/2 year old Whitetail @ 125 lbs is certainly not as tough as a 350 lb Canadian Trophy!

I do like the SST, and for that matter the XTP has served us well too! My complaints are with excessive entrance wound "meat damage", which results in greatly reduced penetration due to energy loss, AND their inability to stay in one piece which means that they MAY not follow the intended shotline.

At BP velocities, both of these bullets may be perfect, but I would PREFER a tougher bullet at the higher velocities. PLEASE NOTE: I did not say that I want a FMJ, nor did I say that I want a Dangerous Game bullet! Merely a bullet that will hold together without creating a hole that you could put a bowling ball into :-)

edge.

Edge,

Would that be a 350lb male or female canadian?