39SBK vs 32Vmax FPS results

[bdweis73]

I finally ran some loads through a chrono, it was interesting according to it 39 SBK's with 24.9 grains of RE 10X, Win Brass and Rem 7 1/2 br primer 10 shot string averaged 3928 Fps out a of 26" barrel savage rifle, and a Remington 26" barrel shooting 32 Vmax with 25.1 grains of RE 10X win brass, and cci 450 primers I got a 10 shot string average of 3807 FPS. Thats a 121 FPS difference with a heavier bullet and and a smaller powder charge. Granted its 2 different rifles and primers, but the 39 grain SBKs at 3900 fps with only 24.9 grains really surpised me I would have guessed around 3700 fps originally, it seemed like hi numbers, but fired a 243 wssm with known numbers and chrono seemed correct. oh ya no pressure signs either Anyone elses thoughts?

[Rick in Oregon]

That just proves that every rifle is a rule unto itself.

Different internal dim's, different degree of barrel resistence, bearing surfaces, components, etc. When I sent my Cooper M21 MTV in 204 back to the factory to have the barrel trimmed from 26" to my more favored 24", I actually GAINED velocity with both the 32's and the 39's....go figure.

[bdweis73]

Ya I'm still scratching my head on it. Also fired case necks on one rifle are coming out at .275 and the other is at .230 wich I understand is normal they both have factory tubes, one is getting replaced after this season think it will be better off as a tent stake as I have never have gotten it to shoot less than an inch. But I have one that I just did personal best 5 shot group with a .4410 at 100 yards.

[247sniper]

My .204 = 25.4 grains of R10 and 39SBK's gives a average of 3707 fps.

[DoubleUp]

Haven't shot RE-10x in a while but my records show 3,725 ave. fps with 39 sbk's, using Win Brass and load of 25.3 gr. out of a 22" barrel Savage with 1x12 twist. Group averages came out to just over .6.

[broper]

From what I've been told, when you shorten a barrel, add flutes or change the structure in any other way it changes the harmonics. Sometimes for the good, sometimes for the bad. If you have a barrel that is already shooting good, be careful about changing it in any way.

[chuckhunter2]

Broper: I agree. Years ago, I had an extremely accurate .222 LV benchrest rifle that was easily capable of winning any match. I sold it to a friend and he wanted a heavier scope so he had an inch cut off the barrel. It destroyed the harmonics and the accuracy was gone.

Tom

[broper]

I have a very accurate Rem. VLS and I was thinking about having the barrel fluted. Two different gunsmiths said they wouldn't guarantee that the accuracy wouldn't change after fluting.

[Tokimini]

Broper, check out the FAQ sections of Shilen's website before you get the barrel fluted. They will not flute a barrel and will void your warrenty if you have a Shilen barrel fluted. They say it creates unrecoverable stresses in the barrel.

[Malazan]

I shoot 3931 FPS with 39 SBK's