Getting most in 40-65 load

[Martini2]

Packing it all in 40-65
Recently there has been very good exchange on loading 40-65s with BP. Of course, all 40-65s are not alike. Some using PP slugs can seat much further into bore to gain powder room. My choice for now is greaser Lyman# 410655. As cast they are 422 grs. and 1.307” length. Loading fired Starline brass it has been difficult to charge 59 grs of GEOX FF with compression so cartridge O.L. fits in chamber with bullet touching in throat. So far using about 0.300” powder compression under 0.060” Circle wad ended up with first lube groove showing. That is 2.805” over all cartridge length. These rounds chamber with thumb pressure. However, the bore fouling has been my nemesis. It was found adding a 0.060” felt/wax wad and use of blow tube cleared most of the fouling between shots. However, accuracy is not up to expectations and scores proved so. A search through cartridge diagrams lead to internals of humble 30-30 WCF sizing die. Note in attached sample drawing the diameters of 30-30 case body make a pretty good taper sizing die for 40 cal. Bullet. A Hornady die was set up in press with the stem that comes with Lee 0.410” push threw bullet sizing die. By adjustment the 410655s were pressed up into the 30-30 sizing die (with stem removed of course). A simple knock out tool was made of brass to tap the bullets lightly back out after taper sizing. The #410655 as cast has all driving bands same diameter (0.410) but after taper treatment the first band is now 0.405” and 2nd band is 0.408” the base is left at 0.410”. The process must be controlled so the bullet nose does not go up against the 30-30 shoulder so the bore riding portion of 410655 is unchanged. Health issue has me bound to loading room at present. The good news is that employing the above technique has allowed loading Don’s favorite recipe of 60 gr OE FF with 0.030” card and SPG lube in the grooves at over all cartridge length of 2.917”. Since THE LOAD was posted be “Himself” it is expected that a next firing session the impacts will form one ragged hole in target ?