If you are talking about the .32 H&R mag then it takes a .312 diameter bullet, not the .308 diameter. I have never tried this combination, but it seems like there shouldn't be enough tension to completely burn the powder. A undersized bullet will never be accurate.
I've got 2 32 Mags and 2 32-20's. The manuals list the .30 cal bullets for them, but the accuracy is not what you'll get with a proper sized bullet, cast or jacketed. The Hornady 100gr XTP has been an all around good performer in all four guns.
The Rugers are .312/314 so you should try a similar sized bullet if reloading. A lot of the manuals list the .308 bullets because Thompson Center made Contender barrels in .32/20 and .32 mag with .308 bores. The Rugers are not. Lyman makes some nice molds with 110 grain bullets that fall out of the mold at about 112grn/.313. Shoot just fine in the .32 mag. You can shoot some .308 to "plink", but loading is a pain and accuracy suffers. Bullets fall inside the sized cases and are tough to seat etc. Not really worth the extra hassels. Magnus, National, and a few of the other bullet companies make nice cast bullets that work well also.
i seem to remember loading 110 gr target bullets that were half jacketed that were intended for the m-1 carbine. i reloaded them for my ruger ssm and they worked fine. there used to be loads listed in some of the reloading manuals for the 32 mag, though i haven't noticed a listing as of late for this bullet. i think the cheapest way is to buy the cast semi wadcutter 105gr, bullets which work well with an appropiate load of 110 or 296 which work extremely well in my ruger. because of the small case capacity you have little wiggle room in loading the 32 mag, i got into some trouble once when i copied a load meant for regualr size bh that had a short run of 32-20 w/ an extra 32 mag cylinder. my little ssm wasn't strong enough and the cases were firmly stuck until i took a wooden dowl to knock them out. ilearned my lesson ! gl
A forum community dedicated to the great outdoors and hunting enthusiasts. Come join the discussion about hunting, fishing, survival, archery gunsmithing, optics, reviews, accessories, classifieds, and more!