40 grain debate

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Saskatchewan, Canada
Hello all.
Just finished up a couple of beautiful days of coyote hunting in Saskatchewan.
Last season season I used 32 gr Sierra Blitzkings in my .204 ruger.
They were traveling at 4125 fps over a load of 8208 XBR. Every coyote, save one, dropped on the spot appearing much the same as a balloon that had just been popped.
Dead Right There! Only a couple sported an exit wound of around 1.5 inches.
I wanted to give the 40 grainers and honest shot this winter.
I have been playing around with CFE 223 and the 40 grain Nosler Ballistic tips and Berger Varmint BT's were getting honest MOA results at just over 3800 fps.
After much night shift academic discussion, my hunting partner decided to try out 40 grain hornady SST's in his Savage axis chambered for .223 Rem.
Using Hornady factory loadings, his shots on dogs yesterday left nearly identical results as I had last year.
Mine however, left massive exit wounds. On one dog, a quartering away shot entering just in front of the left rear leg exited the front right should, and nearly tore it off on the way out. Another had to be the size of my fist!
I was pretty amazed at the difference. And was also awarded some smack talk from my buddy after claiming minimal pelt damage with my little .204.
I understand this is a pretty small sample size to determine scientific results from, but it got me wondering if anyone else has had similar results.
I've been running my mouth about how perfect my .204 was to all my varminting buddies for two years.
Do you think its the extra weight or just the different bullet design that yielded such fur devastation?

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Here's a couple sporting some of the nicest fur we came across over two days.
The mild winter has appeared to help the dogs stay well fed and thick bellied.

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Well, I like 40 grain CT Ballistic Silvertips for coyote, but in .223. I got this one with a 55 gr. Ballistic Tip Varmint, though, because I was deer hunting at the time. The drivers on this hunt kicked it right to me:


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That's my son behind me, the Axis I used is on my shoulder. The deer is his, taken with an AR firing 55 gr. Hornady V-Max handloads.

My 55 gr. load is 25.8 gr. BL-C(2), CCI 400 primers, 2.25" COL. My son's is 24.0 Power Pro Varmint, CCI 400's, 2.23" COL. The 40 gr. is 25.4 BL-C(2), CCI 400's, 2.2" COL.
 
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Bullet weight and speed are only part of the equation.

What are the barrel twist rates?

Besides bullet style/type/design, two things parlay into bullet "performance" at the other end. Speed and rotation. Both work rather well on prairie dogs, not so well on pelts.
 
I scoped out the interweb, looks like my Tikka is 1 in 12 and the savage is 1 in 9
Yup, Savage Axis .223 is 1:9. My son's AR (DPMS Sportical) is also 1:9. Our two loads shoot very close to each other out of each others' guns.

My Song Dog looks pretty scrawny compared to those two.
 
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