.357mag with H110


January 12, 2013, 02:51 PM
I am loading 125 grain winchester jacketed soft hollow points for a bolt action .357mag rifle. My question is my load data is for a 125g hornady XTP wich is jacketed all the way up the bullet and my winchesters are not the nose is lead. The manual says start at 21.0 grains of H110 is this ok for my bullet or do I need to lighten up on the powder charge a little. Thanks for the info never loaded for this rifle or used this powder before just wanted to make sure the load is ok.

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January 12, 2013, 02:58 PM
....you should be fine.

January 12, 2013, 03:14 PM
should be fine, H-110 and w296 are the same power , cross check your load data for w296 some load books show one higher than the other ? I go with the lower one and work up from there

January 12, 2013, 04:11 PM
I use H110 and XTPs in my .357 reloads. I usually do 158 gr XTPs but have done 125 gr XTPs before. Don't take my word for it but my recollection is that 21gr seems light. I have better luck with 158gr XTPs for what it's worth...

***EDIT: Disregard what I said. SteveC below has the right data. ****

January 12, 2013, 04:13 PM
Speers #13 shows 20 grs max for 125 JHP, Lymans shows 22 for the 125 XTP. As usual each manual is different but I would backoff from the 21 grains a little to start.

January 12, 2013, 05:34 PM
I just shot some 125gr XTP's from a 4" Smith @ 20.0gr of H110. Chrono'ed at 1450 fps. and was admittedly a little painful with wood grips. A rifle should be a lot better to handle. I'd start at 20.0. I have seen the same data you are and Hornady showed a max of 19.9 IIRC.

January 12, 2013, 05:39 PM
XTPs have their own reloading data due to different bearing surface. I don't use their load data interchangeably w/ other JHPs. And in this case the min/max charge is only one grain difference according to Hodgdon's website.

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Steve C
January 12, 2013, 05:48 PM
Data from Hodgdon for the .357 mag with H110 for rifles. Use start load and work up if you feel the need. Don't drop below start load since H110 needs sufficient load density to avoid squibs.

January 12, 2013, 06:05 PM
I just checked on loaddata.com , 125gr XTP with W296/H-110 runs from 17gr to 22gr
one load was 17gr W296/H-110 125 gr XTP FED 205 rifle primer,
and one another rifle load was 20gr W296/H-110 125gr XTP with a CCI 550 Mag primer, ,
so check your book and see what primer they are useing and are you looking at rifle data or handgun data ?

January 12, 2013, 07:20 PM
According to Lee, the start charge for H110/W296 & 125gr XTPs is 21 gr, and the max is 22 - both are compressed charges.

Given that jacketed may use slightly less case space, this loading should not produce any greater pressures.

January 12, 2013, 09:14 PM
I highly suggest you stick with the data provided by Hodgdon and don't forget to use a Magnum pistol primer. H110/W296 is a are hard to ignite ball powders so it require a magnum primer and like said above, it does not react well to downloading. That powder will deliver excellent results as long as you take care when using it.

January 12, 2013, 09:15 PM
I've been loading almost exclusively with H110 for decades and have run those bullets on several occasions with full tilt charges, no problem. Just don't get spooked by the data and start reducing to below book starting charges, cause H110 doesn't perform well when taken down below starting charges. Also make sure you use a magnum primer. I've tried standard primers with 296 / H110 on one occasion and it produced a terrible burn and velcoities were all over the place. You could get some inconsistent pressures / burns that could potentially cause squibs too if reduced, and, or, with standard primers.


January 12, 2013, 09:28 PM
Careful with lighter .357 magnum bullets in revolvers. You can get flame cutting above the barrel in the cylinder gap. I use like 15.2gr H110 behind a 158gr jacketed SWC.

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