I've got new Rock barrel coming for my 243AI. My current barrel is slow twist, but I'm moving to a fast twist to shoot the heavies. There are 3 different bullets that I want to focus on: 115 DTAC, 107 SMK & 105 Amax. I want to run the numbers for each to determine best performance and cost. Using a 26" custom barrel what upper end velocity have you guys seen for each? Not primer piercing though...
- Thread starter craigp40
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Re: 243 AI Owners - Velocity Question
105 amax [moly] 3100-3150 never played with the others
105 amax [moly] 3100-3150 never played with the others
Re: 243 AI Owners - Velocity Question
i'm getting 3180 with the 105 a-max out of my sps with the factory 9.125 twist factory 26 inch varmint barrel. no signs of pressure with 44 grains of h-4350.
i'm getting 3180 with the 105 a-max out of my sps with the factory 9.125 twist factory 26 inch varmint barrel. no signs of pressure with 44 grains of h-4350.
Re: 243 AI Owners - Velocity Question
With formed Lapua brass in a 26" Rock 5R 8 twist I'm getting 3258 fps from the 105 AMAX with no pressure.
I've gotten 3127 fps in formed Win brass from the 107 SMK before I saw a very slight ejector stamp and couldn't get near the velocity from the 107 that I did with the 105 AMAX without pressure, even with the same brass. Accuracy was quite respectable in both loads.
With formed Lapua brass in a 26" Rock 5R 8 twist I'm getting 3258 fps from the 105 AMAX with no pressure.
I've gotten 3127 fps in formed Win brass from the 107 SMK before I saw a very slight ejector stamp and couldn't get near the velocity from the 107 that I did with the 105 AMAX without pressure, even with the same brass. Accuracy was quite respectable in both loads.
Re: 243 AI Owners - Velocity Question
115 DTACS
3178 with RL25
3228 with Hybrid 100V
105 Amax
3341 with Hybrid 100V
26" Rock 7.75 twist ABS barrel
115 DTACS
3178 with RL25
3228 with Hybrid 100V
105 Amax
3341 with Hybrid 100V
26" Rock 7.75 twist ABS barrel
Re: 243 AI Owners - Velocity Question
3220fps with 107smk 8 twist at 27" and H4350
3220fps with 107smk 8 twist at 27" and H4350
Re: 243 AI Owners - Velocity Question
115 DTACs with RL-22 (I think 45 grains, but start lower)true 1 in 8, 29'' barrel about 3100 - 3150 fps (anything higher than that lead to primer punctures, but I was using an AW action which has a pretty large diameter firing pin - couldn't get myself to bush the bolt either)and I think 44.5 grains of N165 were giving me about the same results. I don't have the exact numbers with me, so err on the side caution. Ultimately, had pretty bad feeding problems so went to straight .243, but that was just my particular setup.
115 DTACs with RL-22 (I think 45 grains, but start lower)true 1 in 8, 29'' barrel about 3100 - 3150 fps (anything higher than that lead to primer punctures, but I was using an AW action which has a pretty large diameter firing pin - couldn't get myself to bush the bolt either)and I think 44.5 grains of N165 were giving me about the same results. I don't have the exact numbers with me, so err on the side caution. Ultimately, had pretty bad feeding problems so went to straight .243, but that was just my particular setup.
