bullet weight question

The data should be fine! I do suggest you stay out of the max powder range and work your way up.
Also col may differ slightly.
I buy lots of pulled and blemishes bullets and they never tell you the brand or make. Just the type ie..
.355 fmjsp so I find data close and work up.

The standard response: try it, being sure to start low and ladder up. I usually try to match bullet shape and style. ie Hollow Point to Hollow Point, Round Nose to Round Nose. I haven't found a lot of difference in how they shoot using a certain load of powder. It's the ogive that gets me in trouble. Plunk test in your barrel, and every barrel you intend to shoot in. Seating depth varies a lot more than one would think.

Actually I believe xtp have a different lengths bearing surface than most bullets of the same weight. I know frequently my manuals will show xtp with a different charge weight compared to another jacketed hollow point so there is a difference. Yes you can use other 147 gr it's just the load data will be different.

usmc0811 said:

new 9mm load ... 147 grain XTP ... Unique powder.

I found other 147 grain bullets online that are not a "XTP" bullet but some other type like a Gold Dot Personal Protection hollow point and a 147 gr JHP by Speer and or Zero Bullets.

Click to expand...

The main issue is bullet seating depth which affects chamber pressure. Deeper seated bullets will increase pressure and you may need to reduce powder charge.

If you know the length of bullets, you can calculate bullet seating depth by subtracting bullet length from OAL.

Here's a listing of bullet lengths by brand and weight - https://www.jbmballistics.com/ballistics/lengths/lengths.shtml

For example, .355" XTP 147 gr length is listed as 0.655"

For me, if bullet seating depth is comparable to what was used for published load data, I will use the published start/max charges for powder work up. If bullet seating depth is significantly deeper, I will often reduce start/max charges by .2 to .3 gr.

Second issue when substituting bullet type from published load data is compressing powder charge.

Once you determine which bullet you end up using and let us know and we can calculate max case powder fill to see at what powder charge and above you would compress powder charge. We did the same exact thing for member Tony k on this thread for HAP (XTP without expansion cuts) and Red Dot powder - https://www.thehighroad.org/index.php?threads/red-dot-9mm-and-case-fill.848934/#post-11078957