Discussion in 'Small Stuff--22s, 20s, and 17s' started by martini, May 11, 2018.
I wouldn't be afraid to try H4895 either, RL16 was the same as H4350 no speed.
Shot the 20 BRAI for groups for the first time Wednesday. I'm got about 1.5" at 200 yards with 40g Vmax bullets and 8208 or RamShot TAC (four shots in 3/4" first shot was 2" away from the group). Need to increase the powder charge a bit as the hottest loads showed the best accuracy. I haven't chrono'd loads yet so I don't know what velocity I'm looking at.
About 3600 fps out of a 27" barrel with a muzzle break.
I'm going to build one of these 20 br's and need a little help with the free bore dimensions . If anyone has a copy of their print they could share with me and tell me what bullet you shoot would be helpful. My goal is to shoot the 40 grain V-Max because I have over 10,000 on hand. Thanks Jim
Zero freebore would work fine with the long neck of a BR case, .020 max.
Zero is the right answer. Had a reamer maker tell me .068 he was wrong. Reground to Zero.
Places the base of a 55 gr. Berger in the middle of the neck on a BR case.
That case looks kind of like the 5mc2 or whatever they called it with the round shoulder. Probably isn't but it shure looks rounded to me.
I don't believe it is rounded like the McPerson cartridges. Regardless, I shot a 1.1" five shot 200 yard group with the barrel (IMR 8208 and 40g Vmax) and like it well enough so that I ordered a second barrel cut with the same reamer for a heavier Savage project. Given that I have a custom sizer die, I don't see the downside to a second barre.
Using IMR8208 with the 50's > what is the min. & max. powder charge for that combination ?
Unfortunately, I don't have any source for non-custom 50 caliber bullets. I'm not aware of any published data for 8208. I would like like to shot 45-50 grain bullets in my 1:10 barrels but bullets in that weight range are not readily available as far as I know.
20BR IMPROVED > 50gr Bergers and IMR8208 which was very promising for accuracy and velocity.
29.2 grains avg. 3646 fps ES30.0 SD12.00 1.384" group @ 200 yards
29.5 grains avg. 3670 fps ED21.0 SD 9.00 1.004" group @ 200 yards
32.0 RL15 avg. 3658 fps ES35 SD12.0 .835" group @ 200 yards
33.9 H4350 avg. 3640 fps ES65.0 SD25.0 .982" group @ 200 yards
IMR8208 ...is the fastest powder of the three and yielded the lowest ES and SD and will be my focus as I move toward choosing a pet load.
This goes against the thoughts of some who preferred slow burning powders for this calibre.
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