Thank's much! General velocity? Doesn't need to be precise, I'm thinking shorter than that, not a long range competition gun, starter gun for youngster that may have potential.
I've have several cases of 450s, that's all I run in br, bra, gt, cm cases, no issues even in cold weather and always shoot pretty dang good! I've never even tried another srp.
Kinda funny you mention the br4. I did a large primer test on a 65saum that was running 57.5gr H1000 and 135 jlk at 2940 from a 20" barrel with 210M. I tried br2, cci200, 210m and 215M. The br2 had the highest avg velocity of all tested. I'd be curios if you tested the same exact load with cci450 and had a noticeable velocity variation.
Would work with light bullets. I've had success with N150 accuracy wise with 80gr eldm, 33.2gr at 3190 from a 22", case fill is low and I'm not getting acceptable es/sd. Will likely retune with a slower powder. I have good luck with N150 in br variants giving good spreads, but hasn't been the case here.
H4350 has done well with heavies for me around 3100fps. A friend uses 4831sc at 3180, he likes it spicy tho!
That was a thing i'm taking into consideration. I've been shooting 6gt for almost 6 months now and don't have a steady stream of projectiles. I go from 115DTACs to 109 Bergers to Hornady 105BTHPs. I'd like to get more consistency within weights hence there is always a stock of 22 projectiles that i've noticed and cheap and that.
115 dtac have been in stock for a few years now from TUBB. The bullet has had legit 313 g7 from my 7.5tw barrels to 1400y. They're 38¢ a piece, same as the 22cal 85.5 berger.
I see an impact, or a miss 95% the time unless it's a horrible position or heavy veg soaks up a miss. But I've found the slower the bullet, better chance my eyes/brain can see the first reaction the plate rocks L or R if off center impact. The 22 gets there so quickly, I was often catching the 2nd plate movement which is the wrong direction for making a correction, and more often than not, 0.2 mil adjustment would take me off the edge of plate. So I quit trying to make a correction to center with the 22gt. Throat erosion with the 22 is def faster rate than the 6. A guy could always back down the 22 velocity, but in thay case, it starts becoming a more neutral ballistic situation in the wind. Don't fret over drop, as that's the known variable, wind deflection advantage is where ballistics matter. However once you get used to a cartridge/bullet combo and get intimately familiar, it really doesn't matter.
Bore to case capacity ratio. Basically the same case volume, less volume in a 22 bore than a 243 bore. Over bore cartridges are harder on barrels.
The average human eye sees between 30-60 frames per second. A cartridge at 3000fps VS 2600fps at 600y is near 0.1 seconds difference in flight, that's 3-6 more frames of data to see for the brain to compute. I know the flight time variation sound so small that it's no difference however that's enough time to see more. Consistency of recoil management and knowing where the target lands in the reticle in the recoil impulse and training the eye to look there, will give the most improvement in this aspect. I still feel the slower bullet gives a better chance of seeing more data.
I found the loaded od to be 0.253, and I run a 250 whidden bushing, no mandrel.
The 90smk was super easy in my 22br, jumping 20k at 2900 and 2980 it shoot sub half minute with just a lil powder tweaking.
28" pipe. My 22" 22gt will run them up to 3050 before pressure. The heavies should be used with the 170fb 22gt chamber in my opinion.
