Which bits you use are not as important as not allowing them to contact areas that are to remain uncut. Ask which bit would help reach the areas you want to address, without any oopses, and you have your answer. Controlling the tool is more important than cutting speed.I prefer an abrasive filled rubber bit or bob: https://www.mcmaster.com/abrasive-bits/rubber-cushioned-abrasive-grinding-bits-for-metals-8/
I use this type of bit for light material boring and milling with a small drill press and multi vice. along with other burr bits etc. yup
how much to turn tho i have no idea
Did you check tube pressure when those higher velocity results came up? I would guess the reg is probably not doing anything at this point. The shot string looks pretty close to an unregulated setup and I would bet you hit peak velocity around 150-160b indicated.
The rising velocity at the end is the tell-tale sign that the hammer strike is insufficient for the current setpoint (or the setpoint is too high for the hammer strike, whichever way you prefer to think of it). Peak velocity is occurring ~1750psi and all I can say for sure is the regulator setpoint is somewhere north of there...maybe 2200psi if I had to guess. If you want to home in on it experimentally, use an excess of hammer strike so it's operating up on the velocity plateau. The pressure at which the velocity begins to taper off is a good approximation of the setpoint.If your goal is shot count over velocity & energy, reduce the setpoint. If your goal is more velocity and energy over shot count, add more hammer strike....more hammer spring preload or a heavier spring or more hammer stroke or some combination thereof.
there's one last thing i wanna try which is a lighter pellet, not sure why but the heavier i go the more it looks like the hammer is not enough
Wes is the man to help. He's got mine running around 22 fpe with a 100 bar reg setting.
Quote from: Baco on January 23, 2023, 08:29:41 PMthere's one last thing i wanna try which is a lighter pellet, not sure why but the heavier i go the more it looks like the hammer is not enoughYes that is the expected result. Heavier pellets take longer to accelerate so they benefit from the valve being open longer. So in a scenario where there is insufficient hammer strike, heavier pellets will suffer disproportionately.
Quote from: EdinGa on January 23, 2023, 09:02:39 PMWes is the man to help. He's got mine running around 22 fpe with a 100 bar reg setting.Is that with the 25 cal? I'm impressed by the huge increase in efficiency by going to 25 cal. I just tried pushing a .249" NSA slug through both my 9" and 16" barrels and both had ridiculously tight muzzles. The 16" barrel swaged the slug down to .248" or smaller and the rifling engraving was almost flush with the body of the slug! In fact it was so tight I cut myself on the breech when the slug finally popped out. FTT's were also tight in both barrels. I'm emailing Wes to see if this is normal, because I don't think it is. The bores seemed fine otherwise, maybe a few rough spots in the 16" aside from the muzzle. I wanted to see how the .249's went through the barrel to see if they would be worth testing, but now I don't think so. I think this explains the bad accuracy I get past 50'.
i removed the "bstaley" and shot a string again but the chrony decided to reset at the end of the 4th mag shot to shot consistency improved a LOT, the spread overall(+-16%) is not good, it's peaking at 682fps on shot 24 valve porting increased the force needed to open valve too much for the poor hammer even with extra weightso next thing to do is lower the reg just a bit till i can get 5% ES with the stock hammer/springQuote from: EdinGa on January 23, 2023, 09:02:39 PMWes is the man to help. He's got mine running around 22 fpe with a 100 bar reg setting. i believe we're getting there soonQuote from: nervoustrigger on January 23, 2023, 08:57:19 PMQuote from: Baco on January 23, 2023, 08:29:41 PMthere's one last thing i wanna try which is a lighter pellet, not sure why but the heavier i go the more it looks like the hammer is not enoughYes that is the expected result. Heavier pellets take longer to accelerate so they benefit from the valve being open longer. So in a scenario where there is insufficient hammer strike, heavier pellets will suffer disproportionately.yeah exactly what i was seeing in practice, and that is now aggravated with the portingQuote from: Spacebus on January 23, 2023, 10:04:27 PMQuote from: EdinGa on January 23, 2023, 09:02:39 PMWes is the man to help. He's got mine running around 22 fpe with a 100 bar reg setting.Is that with the 25 cal? I'm impressed by the huge increase in efficiency by going to 25 cal. I just tried pushing a .249" NSA slug through both my 9" and 16" barrels and both had ridiculously tight muzzles. The 16" barrel swaged the slug down to .248" or smaller and the rifling engraving was almost flush with the body of the slug! In fact it was so tight I cut myself on the breech when the slug finally popped out. FTT's were also tight in both barrels. I'm emailing Wes to see if this is normal, because I don't think it is. The bores seemed fine otherwise, maybe a few rough spots in the 16" aside from the muzzle. I wanted to see how the .249's went through the barrel to see if they would be worth testing, but now I don't think so. I think this explains the bad accuracy I get past 50'. the barrel Wes sent me the 6.35mm slugs were like you described, the 6.34mm go down easy but some ppl say you need them sized to contact groove diameter so idk what to say
My bores are only tight right at the muzzle, and one of the barrels swaged the slug until the difference in the rifling impressions and the body of the slug were almost nonexistent. I think both muzzles are too tight, tighter than a choke should be. Even with pellets I have great difficulty getting them out of the bore. My 177 barrel that shoots perfect is smooth as silk the whole way down. I sent Wes an email and asked what there is to be done.
My bores are only tight right at the muzzle... I think both muzzles are too tight, tighter than a choke should be.
one of the barrels swaged the slug until the difference in the rifling impressions and the body of the slug were almost nonexistent.