Here is what Hornady posts about their 230g XTP bullet. Reading down the page one sees they say it has a usable velocity range of 600-1650 fps. It seems to me this bullet would be ideal for grand daughter.

Testing this past summer showed that most bullets won't work at low speeds; they don't expand. This here bullet would continue to expand at speeds, and below, at which the 240g, or 250g bullets fail to work. Here is a link to a test of the 250g XTP pushed by 50g Blackhorn at 25 yard. The bullet was traveling too slow to expand. The 250g XTP--80g bullet was also tested when pushed by 80g of Blackhorn at 25 yard; it worked great.

Another bullet that works at low speeds is the Lehigh Defense Controlled Fracturing bullet. This is THE bullet one can count on to work at all speeds.

Do not use the 230 grain .451 XTP bullet for deer. The old Hornady chart lists the design velocity as 850-1200 fps.

Tracked a lot of wounded deer and elk for other hunters. One evening a hunter shot a huge buck with his Knight rifle loaded with that 230 grain bullet. We found the deer mid morning the next day. The bullet disintegrated and the deer had suffered horribly.

Hmm, i guess i wouldn't use this 230g XTP bullet in my rifle no matter if the powder charge was only 60g; i would be too nervous even if Hornady say it is OK.

OK, following is a LINK to a test of the 250g XTP, 250g TEZ, and the 245g controlled fracturing bullet. Only 50g of powder was used, and it wasn't enough, even at 25 yard, for the XTP, nor the TEZ to work. The Lehigh Contoled Fracturing bullet worked good.

I've actually used the 240, 260, and 300 scorpions. When I was using them it was in Pa and the deer ,body wise, just aren't all that big for the most part in Pa. Didn't really feel I needed really big bullet weights and most all of my shots where I ML hunted were well within 75 yards so I didn't need heavy loads either. I used those 240's over 70 grains T7 loose out of that old hawken. Recoil was very moderate and that old hawken of mine hates heavy powder loads anyway. Never could find a bullet that was accurate out of her with anything over 80 grains. My TC PH on the other hand shoots shotgun groups with anything under 95 grains.

Ron also gave you a superior bullet choice in the Lehigh CF bullets. I've done some testing with those bullets and they are deadly accurate out of both mine as well. But they are a little salty in price. The .452 245 grain CF is being reported as an outstanding bullet for MLers. I'm letting my daughter use my hawken this year since I am out of action for this years hunting. She is very recoil sensitive so I settled on the 250 Bloodlines over 70 grains Swiss FFG which is about at her limit for recoil. The bloodlines are the predecessor to the CF's and everyone that I have heard of using them always give them the thumbs up. Bloodline also has 220 grain bullets that may be just the ticket. Not sure where your granddaughter will be hunting nor the average size of the whitetail around there. Here in IL we have Does that will rival Buck size in a lot of other states. We gots some big ole girlies around here :D so I chose the 250's for the added "thump".

Lehigh 185g Controlled Fracturing Bullet
 

The 185g Controlled Fracturing was tested using 50g of Blackhorn powder, and also 80g of Blackhorn powder. In both tests, the performance of the bullet was superlative. Here is a link to the 50g Blackhorn test, followed by a link to the 80g powder test. This might be the bullet i would have my grand daughter shoot, using a small powder charge, because one can know for sure it will work as designed at any speed. Recoil should be quite manageable for a small child.

Keep in mind more bullets failed to work in this test, than succeeded, when the powder charge was only 50g, at only 25 yard.

Someone wanna tell me how this thread went from "Powder charges and Round balls" to whatever it has progressed into?

BPS

It's just the way the wind blows sometimes BPS. Kinda` like a bull session around the campfire. Somebody throws in an odd thought and the discussion gets diverted. It must not bother us much, because we keep doing it. :D

Well Old Bob, your statement that you consider hunting with round ball less than .600 to be unethical, also says that you consider anyone who hunts with patched round balls less than .600 unethical hunters, even though you said it "nicely." I take exception to that! I have hunted with patched round balls since 1980 and have had great success with them over the years. I do not have a track record of wounding deer. I have used patched round balls from .445 - .575 and all of the standard calibers in between for all of these years. I will admit that patched round balls are not a 200 yard bullet but at moderate ranges (10 - 75 yards) they are very accurate and kill quickly and cleanly. I make this statement, not from something that I read out of a magazine but from personal experience. I know that there are those of you who can quote all kinds of ballistic data from charts but deer don't read charts. The only deer that I have ever shot with a .445 round ball. went down like I had hit him in the head with a baseball bat. The last deer that I shot was with a .570 round ball and he ran 35 yards and crashed. No matter what a hunter chooses as a tool to hunt with, he/she must know the limitations of the equipment that they are using and must also know their own personal limitations and place that shot exactly where it needs to go. That is what an ethical hunter does. Those who will take a marginal shot at game with any gun, bow or bullet combination are unethical hunters. It is personally insulting to me that you would lump all of us who hunt with patched round ball into the unethical hunter group.

Well said David, my sentiments exactly!

BPS

I bought my first flinter in 1977, a .45 caliber from Bob Watts, used it until 1990 when bears got plentiful in eastern NC...I had built a .54 by that time so I converted the .45 to a .40 for squirrels...

I killed plenty of deer with the .45 and 75grs of FFF Goex the only reason I switched to a
.54 was in case I had a run in with a bear...I've killed about 50 deer with the .54 and 80grs FFF Goex...

Why do I use a flintlock and roundballs??? Well, how are you going to learn about history and the use of flintlocks unless you gain experience?? For over 30 years I have given talks to schools and Boy Scouts here in NC...I carry them through the times of the Lost Colony to Jamestown to Kings Mountain, Cowpens and Guilford Courthouse...I let them know about a local fellow from Pennsylvania named Daniel Boone who crossed the Smokey Mountains to hunt over into Kentucky...It's been very rewarding as my daughter decided to be a history teacher and I have a former student that built a flintlock for his Senior project, was a sniper in the Marines and is now a Game Warden...

I don't think talking about history with an inline in my hands would have been very effective.... :)