RCBS 270 SAA

[Paden]

Jul 17, 2018 17:49:51 GMT -5 shorty500 said:

Jul 17, 2018 17:33:05 GMT -5 mike454 said:

I'm guessing closer to 20,000. Had a buddy that shot this bullet out of his new frontier with a heavier charge of H110 with no problems. Not recommending it, just reporting what I saw.

I would also place it in the 20-23Kpsi range as well

Hmmm. Color me skeptical.

FWIW, here's a snip from my personal aggregate reference sheet (sorry the formatting doesn't stick):

260 grn JSP:
16.0 2400 1045 Speer #12
18.0 2400 1180 Max Speer #12
18.5 H-110 1042 Speer #12
20.0 H-110 1151 Max Speer #12

260-280 grn cast (45-270-SAA, 282 grain actual weight):
9.0 V-N350 892 <14,000 psi Pearce HL #246
10.0 V-N350 970 <20,000 psi Pearce HL #246
11.0 V-N350 1037 <23,000 psi Pearce HL #275
12.0 V-N350 1104 <23,000 psi Pearce HL #275
13.0 V-N350 1171 <23,000 psi Pearce HL #275
16.0 V-N110 894 <14,000 psi Pearce HL #246
16.0 2400 987 <14,000 psi Pearce HL #246
17.0 2400 1012 <20.000 psi Pearce HL #246
18.0 2400 1038 <23,000 psi* Pearce HL #275
18.0 2400 1093 <20,000 psi* Pearce HL #246
18.5 V-N110 1325 Taffin 7 1/2 Redhawk
19.0 2400 1145 <23,000 psi* Pearce HL #246
19.0 2400 1165 24,800 cup* Linebaugh
20.0 2400 1195 <32,000 cup Pearce HL #246
20.5 2400 1294 29,800 cup Linebaugh
21.0 2400 1262 <32,000 cup Pearce HL #246
23.0 LilGun 1365 <32,000 cup Pearce HL #246
24.0 H-110 1280 Linebaugh JL's fav load (personal conversation)
24.0 H-110 1327 <32,000 cup Pearce HL #246
25.0 H-110 1387 <32,000 cup Pearce HL #246
25.5 H-110 1364 24,800 cup Linebaugh
27.0 H-110 1459 30,600 cup Linebaugh Max (personal conversation)
28.0 H-110 1450 Linebaugh 5 shot cylinder ONLY! (7.5” barrel)
32.0 H-110 1750 Max Linebaugh 5 shot cylinder ONLY! (7.5” barrel)

[mike454]

Hodgdon lists a 325 plainbase and 21 grains of h110 at 1100fps and 18,000 CUP. Also have some data with a 260 keith bullet that jim taylor had pressure tested that supports low 20s as well. Fact is I've never seen h110 pressure data for this bullet so just speculation on my part and I could be way off. I do know amount of H110 the fellow that shot this bullet out of a new frontier used was sufficient to push the bullet to 1350 fps. Surprised him as well as myself, we were both expecting to see 1150-1200 fps.

[mrxhillbilly]

I also saw the hodgdon data but was hoping someone had some real world experience with this bullet and h110

I had some cast performance 325 LFN PB bullets and compared them to the 45-270-SAA bullets and if I seat them with the front driving band just inside the case they take up the same amount of space in the case. If I understand correctly H110 doesn’t like a lot of free space in the case so I think this will work well. I loaded 10 last night and plan on trying five in my five shot 454 to test them and if they seem pretty mild I will try the other five in my Midframe 45 colt. I didn’t want to use the 325 LFN because they extend all the way to the end of the cylinder and the 45-270-SAA seated just past the front driving band leaves plenty of room. I’ll keep you guys posted.


Update.

Fired one round in the 454 and it seemed fairly mild so I fired the other nine in the midframe Bowen lightweight. Definitely can tell you’re shooting h110 in a lightweight gun but all nine rounds hit the 8” swinging target at 25’ when shooting offhand. I wouldn’t want to shoot it all the time but I feel like this would be an excellent bear hunting round and will be investigating further into it. I do not have a chronograph so I don’t know velocity. FWIW

[Cholla]

Jul 16, 2018 17:42:57 GMT -5 mrxhillbilly said:

Has anyone loaded this bullet over 21gr of H110 for use in a Ruger flattop mid frame revolver?

I Don't know what velocity you're looking for, but I've had very good accuracy with this bullet (288 grs.) using Unique.





The above load netted a hair over 900 fps in the 4 3/4" Uberti Frisco which is the same size revolver as the mid-frame Blackhawk. Last week I tried 9.0 grs. of Unique and it ran 950 fps and was quite accurate too. I then bumped the charge up to 9.5 grs. which resulted in 999 fps, but I didn't have time to shoot for accuracy. Maybe tomorrow...

I personally avoid H-110 in all but very upper end loads as I've read it can be a little screwy when loads are less than absolute maximum.

Here's the link to the Brian Pearce column on this bullet: RCBS 45-270-SAA

[bullseye]

Bringing it back up about the possibility of getting a group buy of the MP version of this mold going...I'm currently running two, 2 cavity RCBS molds at a time when casting this fine bullet but would gladly give up the practice for a single 4 cavity MP version!

[alamogunr]

Jul 21, 2018 18:38:07 GMT -5 bullseye said:

Bringing it back up about the possibility of getting a group buy of the MP version of this mold going...I'm currently running two, 2 cavity RCBS molds at a time when casting this fine bullet but would gladly give up the practice for a single 4 cavity MP version!

Check over on Cast Boolits. They run a GB on this mold occasionally. I've got 2 four cavity molds that I bought from 2 different GB's. I also got a 2 cavity HP version from another GB.

[Fowler]

Jul 21, 2018 18:38:07 GMT -5 bullseye said:

Bringing it back up about the possibility of getting a group buy of the MP version of this mold going...I'm currently running two, 2 cavity RCBS molds at a time when casting this fine bullet but would gladly give up the practice for a single 4 cavity MP version!

Run 2 4 hollers and you can make big piles of great bullets in a hurry.

[clintsfolly]

If your going to run 2 4cavity add a second pot to the mix or get a 40lb pot!m

[bullseye]

I had one of mine converted to hollow point by Erik Ohlen, but with an MP version I could get 2 solids & 2 HP's from one mold...Which would provide me with all of the 270 SAA bullets I'd need. I always run 2-3 molds at once when casting unless I'm ladle casting precision rifle bullets for BPCR.

[lah]

Jul 22, 2018 10:12:25 GMT -5 clintsfolly said:

If your going to run 2 4cavity add a second pot to the mix or get a 40lb pot!m

I use a 40 pound pot & add alloy every 15 minutes of so.

[clintsfolly]

When I was casting for production I used a 40 lbs pot with two 10lbs Lee pot setup to feed the big one. Had 8-10 cavity molds the bullets just rained!