What kind of speed differences are there between these two calibers?
- Thread starter Raptorman2014
- Start date
Like top end speed? Or usable speed?
If 300,000rpms is your top end, not much difference. That will be between 3100 - 3200 depending on your barrel twist 1:7 - 1.7.7". Pretty decent speed for 85gr plus bullets.
Just a different case capacity form factor for using different powder. StaBall and H4350 is kind of too fast for CM. Pressures out at 80'ish % case fill. RL23, 4831SC, N555 provides 95% case full. The GT seems like it can run the same speeds using StaBall and H4350 with a more full case capacity.
If you use a slow twist and lighter bullets or dgaf about blowing up bullets later on in the barrels life the CM probably gives about 300fps more top end speed.
I would go with 22GT in a short barrel varmint rig. If you don’t have the barrel length to burn the slow powders 22Cm needs, you might as well go with the smaller powder column and save money and barrel life.
I started with a 20" 22BR for a short maneuverable setup. I was constantly dealing with pressure trying to break 3000fps. I sold that barrel and got a 22" carbon 22 Creed. I'm pretty happy with it. It is light enough for me. It is a low round count hunting barrel. 1:7.7". I keep it under 3200 except for the occasional 60gr VMAXs I shot at Pdogs last month. But I'll never have to worry about reaching the top end of pressure in a shorter barrel. I've got a 26" 22GT that I need to do load development on. It's a heavy M24 contour going on a barricade, PRS gun. I will try to run the 88's or 90's at 3100 - 3150. Leveraging the longer barrel to get my velocities up with less powder. Hopefully it will be low pressure using a slower powder and I can get 1800rds out of it. Kind of a cheaper PRS gun vs a Dasher shooting 105 Hybrids and H4350. That's how I'm distinguishing the two cartridges in my head anyway.
I have a 26" 6GT that Bugholes spun up for my AT-X. I don't compete, I just like AI's and wanted to give the GT a try. It's stupid accurate with 105 hybrids @ just under 3,000 fps. I gotta believe that 22GT will perform similarly and I'd like to replace the R700 in .223Rem that I've had for years. I simply don't find the pleasure in shooting it anymore (it's just not an AI). 
I have/had both
22 creed in 17" barrel pushing 60 vmaxes hard I got 3700fps and good accuracy.
22 GT with 18" barrels, I'm getting 3500fps with the same bullet. My accuracy is almost unbelievable (10twist barrels). I'm also using 3-4 grains less powder.
Looking back, for the varmint bullets, I am 100% happier with the GT and now have 5 barrels spun up, 2 are rechambered from the 22 creed. I'm using H4895 and so far my furthest was 370yds on a coyote last week with my thermal.
22 creed in 17" barrel pushing 60 vmaxes hard I got 3700fps and good accuracy.
22 GT with 18" barrels, I'm getting 3500fps with the same bullet. My accuracy is almost unbelievable (10twist barrels). I'm also using 3-4 grains less powder.
Looking back, for the varmint bullets, I am 100% happier with the GT and now have 5 barrels spun up, 2 are rechambered from the 22 creed. I'm using H4895 and so far my furthest was 370yds on a coyote last week with my thermal.
I bought the reamer from GA, I think it was the .120? At the time it was the only reamer they carried
My 25" barrel 22 creed was running 3900fps with 60s, but I made it 180 rounds on prairie dogs before I was having bullets fragment after leaving the barrel.
I went all carbon barrels and the lightest chassis and stocks available for hunting. I have heavier bullets, but for now, 60 vmaxes are easy to get and I have a real good stockpile. So far, the past year, no coyotes needed a follow up shot using the 22 GT and I'm good with that. The other plus, it's a dedicated small rifle primer case and I have a good supply of primers from back when they were $23 per 1k
I went all carbon barrels and the lightest chassis and stocks available for hunting. I have heavier bullets, but for now, 60 vmaxes are easy to get and I have a real good stockpile. So far, the past year, no coyotes needed a follow up shot using the 22 GT and I'm good with that. The other plus, it's a dedicated small rifle primer case and I have a good supply of primers from back when they were $23 per 1k
