45-70 loading question

[bfoosh006]

BTW... remember Remington 405gr .458 bullets are stepped profile... so do not substitute that load data for other 400ish gr bullets.

You can see it in the first photo... they are a narrower profile towards the tip, then the rest of the shank / bearing surface.

[XxWoodsHunterxX]

If they are for your Sharps you can have a lot of fun with cast bullets. On the longer heavier bullets I drop a bullet into the chamber then using my calipers to check the distance from bullet base to where the cartridge rim will sit, this is my OAL or how deep I seat the bullet into the case. I hope this makes sense. I do use Swiss 1.5 Fg
Cruise missiles from a few years back.

Those look like my 500gr Travis Frick .458s.

[pacrat]

And Bingo.

There is your primer flow issue. If you are happy with the lower pressure loads. You don't really have to do anything to it. I would advise against using Federal primers. Don't know about now, but they used to be softer than CCI or WW.

If you want to start bumping pressure for higher performance/velocity such as hard hitting hunting loads. You can have the breech face "bushed" to closely fit the pin. Which will stop the crater/flowing.

JM2c

[SFCRangerDoc]

Sorry guys, it took me longer to get a couple pix. Heres 2 photos of the breech block and the firing pin pressed so its at full extension. It does appear theres quite a bit of gap between it and the hole...

[SFCRangerDoc]

Does the firing pin fit too loosely in the bolt face allowing a lot of room around it for the primer to flow into the space?

OH, quite possible. The IAB Sharps copy isnt the 'greatest' copy of a sharps ever and the firing pin hole is kinda large. It actually shreds off brass shavings from the primers when I drop the breech. I was thinking about taking a fine file to the edges to smooth them out but the firing pin hole is definitely on the large size. Other than that the primers dont seem to be flattened out. I'll try to post a pic of the firing pin area tonight.

[JagerDog]

ya..cratering by itself isn't neccesarily a sign of high pressure. If coupled with flattened primers then it is.

[M1NM]

I'm not sure I follow. Could you explain what you mean?

Does the firing pin fit too loosely in the bolt face allowing a lot of room around it for the primer to flow into the space?

[SFCRangerDoc]

Did you check your FP to breech face hole clearance as possible flow problem?

I'm not sure I follow. Could you explain what you mean?

[pacrat]

So i loaded up 25 rds of my above listed recipe and shot them today. No issues what so ever. I did get a little primer flow so I may back off the charge a smidge but overall the 405's were quite enjoyable and as far as I can tell accurate!

Did you check your FP to breech face hole clearance as possible flow problem?

[SFCRangerDoc]

So i loaded up 25 rds of my above listed recipe and shot them today. No issues what so ever. I did get a little primer flow so I may back off the charge a smidge but overall the 405's were quite enjoyable and as far as I can tell accurate!

[Tom-ADC]

I did this mod to my Lee .457 sizer. It works great for the bullets I size.

https://www.youtube.com/watch?v=IEa2jeV-BKs

[Tom-ADC]

If they are for your Sharps you can have a lot of fun with cast bullets. On the longer heavier bullets I drop a bullet into the chamber then using my calipers to check the distance from bullet base to where the cartridge rim will sit, this is my OAL or how deep I seat the bullet into the case. I hope this makes sense. I do use Swiss 1.5 Fg
Cruise missiles from a few years back.

[Fjold]

However my question is OAL length. Book says 2.550 for OAL however the bullets i have are double cannelure and if i set it to 2.550 the bullet is seated well past the second one. If i seat to the very top of the 2nd cannelure its appx 2.660 OAL.

The listed (recommended) OAL is one of the listed factors that go into that recipe to get the listed pressure/performance. Recommended OAL is just a guide

I don't have a chamber gauge but i've read i can just make a dummy round and seat it really long and then start pressing it in until the round fits and that's my chamber size.

Actually that will give you an approximation of the max OAL since the lands will dig into the bullet as the bullet is being inserted into the case. Reduce the OAL by .005" and test again until you get no marks on the bullets.

[SFCRangerDoc]

Wow. Do you need a "limb saver" recoil pad for that beast?

Nah i shoot the beast bareback! Steel buttplate and all...off hand its manageable...benched? bruuutal no pain no gain though!

[orangeusa]

Wow. Do you need a "limb saver" recoil pad for that beast?