Have heard that the folks in Great Britan had some pretty lousy weather. Glad to hear your 280 AI job turned out ok. Keep us posted. Frank
Ok I chambered the barrel using a Forster Go Guage on Tuesday and fired one round on Wednesday after collecting the ammunition from the shop then Weds afternoon took the barrel off and polished the chamber with some metal polish and a picece of very fine emery cloth. More of a burnishing op really as extraction was very easy and smooth then Weds evening fired the other five rounds for the cases I need so have fired a total of 6 rounds through it now. Three of the cases will become dummies to test feeding from the magazine. Three are wanted by the proof house to use to make up proofing rounds. Here is the first one fired before the chamber was polished:-
Alongside the factory Remington 156 Grain bullet. The expansion rings measures 0.468", the shoulder 0.454" dia. The shoulder is 2.090" from the head of the cartridge and the fired neck mesurement is 0.315" which is nice as the unfired factory ammunition measures 0.311" so it gives 0.002" per side clearance so should a different make of cases vary slightly in thickness at the neck it should cause a problem yet it's tight enough hopefully to help with precision. Rolling the cases across a flat surface shows no noticable neck run out but I'll need to check with a Vee block and DTI to see how good it actually is.
Considering I have to cut a few corners in the chambering set up and could not do it the best possible way I am pleased with the result .
The bullet in the dummy was Remington 175 Gr Semi Spitzer. It's since been changed for a 139 Grn BTSP Hornady as I did not get the sizing set turned down enough and the Remington bullet was just a trifle lose. A slight adjustment to the die cured that little issue . Right now the barrel is soaking with Forest Foaming bore cleaner to remove any copper left behind by my fire forming shots. I scrubbed the bore first with P-H 009 then patched it out but I want it almost spotless to go to proof. Hopefully it will only be a week before it's returned. I could make an appointment and take it myself but they charge double for that and it will take most of the day as they would have to load the proof ammunition whilst I waited and adding the traveling time to Birmingham and back. Although I would like to go and see the place right now I cannot spare the time.
Of course next thing is to get some powder and check load data for the Ackley Improved. Ackley suggests 63.0 Gr of IMR 4350 behind the 140 grain bullet for a claimed 3320 fps. I'll check more sources for data and borrow the clubs chronograph to see what this 23" barrel gives velocity wise. Hmm Just did a search and found some interesting data. The Nosler site was very useful and it seems that IMR 4350 is a very good powder. H 4831SC gets a lot of mention but IMR 4831 shades it for velocity in their listings so we shall see what I can get locally. OH the Vhit N160 and N165 also seem contenders. The load in Axkleys book is a bit on the hot side it seems as Nosler list 58.0 Gr as the max load with a 140 grain bullet.
Oh gunnut, . not every oen lieks Hollow points and that's really what the ballistic tips and bronze points are.